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<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
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  <title>Document</title>
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  <!--jsonp 接口调用-->
<script>
 fetch("http://localhost:3000/api/aaa").then(res => res.json()).then(res => {
   console.log(res)
 })
</script>
</body>
</html>